Last updated July 2026 · 6 minute read
The short answer. Collagen is the most abundant protein in your body and the main structural protein in skin, hair, nails, joints and connective tissue. It keeps skin firm and hydrated and joints cushioned. From your mid 20s your body makes less of it, which is why many women take a daily supplement.
The body's building block
Collagen makes up around a third of the protein in your body. Think of it as scaffolding: it gives skin its structure, strengthens hair and nails, and forms part of the cartilage that cushions your joints.
What collagen does day to day
- Keeps skin firm, smooth and hydrated
- Supports strong hair and nails
- Forms part of the cushioning in joints
- Supports connective tissue throughout the body
Why it declines
From your mid 20s, natural collagen production slows by roughly 1% a year, and the fall steepens around menopause. See the signs of collagen loss. Supporting it from within is why women turn to hydrolysed marine collagen.
Eternal Collagen: 15,000mg in one daily cap
Hydrolysed marine collagen, enriched with 19 essential vitamins and minerals, in a tropical flavour that mixes easily into water, juice or a smoothie. One 25ml cap a day, made in the UK.
Frequently asked questions
What is collagen?
Collagen is the most abundant protein in the body and the main structural protein in skin, hair, nails, joints and connective tissue.
What does collagen do?
It keeps skin firm and hydrated, supports strong hair and nails, and forms part of the cushioning in joints.
Why does collagen decline?
Natural production slows from your mid 20s by roughly 1% a year, and faster around menopause, which is why many women supplement.
What is the best way to boost collagen?
Support it with a daily hydrolysed marine collagen, plenty of protein and vitamin C, good sleep and daily SPF.